Electric Literature of 4411-80-7, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.4411-80-7, Name is 6,6′-Dimethyl-2,2′-bipyridine, molecular formula is C12H12N2. In a article，once mentioned of 4411-80-7
Two novel heterotrinuclear chromium(iii)-cobalt(ii) complexes of formula {[CrIII(bpy)(ox)2]2CoII(Me 2bpy)}·2H2O (1) and {[CrIII(phen)(ox) 2]2CoII(Me2bpy)}·1.5H 2O (2) [ox = oxalato, bpy = 2,2?-bipyridine, Me2bpy = 6,6?-dimethyl-2,2?-bipyridine, and phen = 1,10-phenanthroline] have been synthesized using the “complex-as-ligand/complex-as-metal” strategy. The X-ray crystal structure of 2 consists of neutral oxalato-bridged CrIII2CoII bent entities formed by the coordination of two anionic [CrIII(phen)(ox)2]- complexes through one of their oxalato groups toward a cationic cis-[Co II(Me2bpy)]2+ complex. The three tris(chelated), six-coordinated metal atoms possess alternating propeller chiralities leading thus to a racemic mixture of heterochiral (Lambda,Delta,Lambda)- and (Delta,Lambda,Delta)-Cr IIICoIICrIII triads, whereby the two peripheral chromium(iii) ions adopt a trigonal distorted trapezoidal bipyramidal geometry and the central high-spin cobalt(ii) ion exhibits a compressed rectangular bipyramidal one. The intermolecular pi-pi stacking interactions between the enantiomeric pairs of heterochiral CrIII2CoII entities through the aromatic diimine terminal ligands lead to a unique two-dimensional supramolecular network. Variable temperature (2.0-300 K) magnetic susceptibility and variable-field (0-5.0 T) magnetization measurements for 1 and 2 reveal the presence of weak but non-negligible intermolecular antiferromagnetic interactions [zj = -0.012 (2a) and -0.08 cm-1 (2b)] between the CrIII2CoII molecules possessing a moderately anisotropic S = 9/2 ground state. This results from the moderately weak intramolecular ferromagnetic coupling [J = +2.43 (1) and +2.34 cm -1 (2)] between the two peripheral CrIII (SCr = 3/2) and the central high-spin CoII (SCo = 3/2) ions across the oxalato bridge as well as the appreciable single-ion axial magnetic anisotropy of the central high-spin CoII (SCo = 3/2) ion [DCo = -2.29 (1) and -2.15 cm-1 (2)]. A simple molecular orbital analysis of the exchange interaction in 1 and 2 identifies the sigma- and pi-type pathways involving the dx2-y2(Cr)/dxy(Co) and dxz(Cr)/dyz(Co) pairs of orthogonal magnetic orbitals, respectively, as the two main individual contributions responsible for the overall ferromagnetic coupling observed. The Royal Society of Chemistry 2010.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI